* Simplify the determination & detection of the desired package manager.
* Add the `package-manager` option on plugin creation.
* Nx Cloud installation uses the appropriate package manager.
* feat(core): adds configurable base branch in nx.json
new field in nx.json - defaultBranch
ISSUES CLOSED: #1791
* feat(core): split affected into config options for base and head in nx.json
Co-authored-by: agriggs <alex.griggs@gmail.com>